package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /*
     * 新增菜品和对应的口味*/
    @Override
    @Transactional(rollbackFor = Exception.class)//事务注解，操作两张表
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入数据
        dishMapper.insert(dish);
        //获取insert语句获取的主键值
        Long dishId = dish.getId();
        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //判断口味表是否为空，是否提交过来了
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /*菜品分页查询*/
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //通过PageHelper开始分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());
    }

    /*菜品批量删除*/
    @Transactional(rollbackFor = Exception.class)//事务注解
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除--状态是起售中
        for (Long id : ids) {
            Dish dish =dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //当前菜品是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //说明存在菜品被套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜皮数据和菜品关联的口味数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            dishFlavorMapper.deleteByDishId(id);
        }*/
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除菜品关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /*根据id查询菜品*/
    @Override

    public DishVO getById(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavor =dishFlavorMapper.getByDishId(id);
        //将数据封装返回
        DishVO dishVO = new DishVO();
        dishVO.setFlavors(dishFlavor);
        BeanUtils.copyProperties(dish, dishVO);

        return dishVO;
    }

    /*修改菜品信息*/
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        Long id = dishDTO.getId();
        //删除口味表原有的口味数据
        dishFlavorMapper.deleteByDishId(id);
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });
            //判断口味表是否为空，是否提交过来了
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /*起售禁售菜品*/
    @Override
    public void updateStatus(Long id, Integer status) {
        //根据id 更新菜品销售状态
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);

        if(status == StatusConstant.DISABLE){
            //如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            //select setmeal_id from setmeal_dish where dish_id in(?,?,?)
            //判断菜品与套餐是否有关联
            List<Long> setmealIds =setmealDishMapper.getSetmealIdsByDishId(dishIds);
            if(setmealIds != null&&setmealIds.size()>0){
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder().id(setmealId).status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }


        }
    }
    /*根据分类id查询菜品*/
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = new Dish().builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();

        return dishMapper.list(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
